Fans from all over the world were inspired by the courage the brave Bulgarian showed to defy the odds and battle back from acute leukaemia.

Last night only a handful of fans witnessed the 37-year-old’s low-key return to action in the tranquil surroundings of GAK’s humble stadium – six flights removed from the top tier of Austrian football.

However the 45 minutes Petrov managed after the break represent another unexpected victory in his quest to return to senior football.

“He’s worked really hard over the summer. He lives out by me and I’ve seen him out working on his fitness.

“He’s got lots of experience to give to the young lads who all respect him.”

Di Matteo was happy at his team’s first run-out, as new goalie Gianluigi Gollini kept a clean sheet, while new £5.5million midfielder Aaron Tshibola is expected to arrive here later today after finalising his transfer.

The Italian boss said: “I’m very pleased with the workout. The players have been working extremely hard in training. We even had a training session this morning so it’s demanding physically.